Balance the following chemical equation:

Fe(s) + H₂O(g) → Fe₃O₄ + H₂(g)

N₂ + 3H₂⇋ 2NH₃ + Heat

What can be concluded from the above reaction?

Why do iron articles lose their shine gradually?

State one industrial application of reduction.

A blue coloured salt of copper sulphate becomes white on heating. Give reason.

What type of chemical reaction takes place when silver bromide is exposed to sunlight?

Classify the following chemical reactions as exothermic or endothermic:

A. Electrolysis of water

B. Burning of natural gas

C. Decomposition of calcium carbonate

D. Burning of magnesium ribbon in air

What change will you observe if white silver chloride is placed in sunlight? Write an equation for the reaction and the type of the reaction.

What happens chemically when quicklime is added to water?

Explain the following terms:

Corrosion

Explain the following terms:

Rancidity

Identify the type of chemical reaction taking place

i. on making a solution of potassium chloride with silver nitrate, an insoluble white substance is formed.

ii. on heating green coloured ferrous sulphate crystals, reddish-brown solid is left and smell of a gas having odor of burning Sulphur is observed.

Write a balanced chemical equation for each of the following reactions and also classify them.

Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

Write a balanced chemical equation for each of the following reactions and also classify them.

A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

Write a balanced chemical equation for each of the following reactions and also classify them.

iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.

Write a balanced chemical equation for each of the following reactions and also classify them.

Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

Balance the following chemical equations and identify the type of chemical reaction.

Mg(s) + Cl₂(g) → MgCl₂(s)

Balance the following chemical equations and identify the type of chemical reaction.

Balance the following chemical equations and identify the type of chemical reaction.

Balance the following chemical equations and identify the type of chemical reaction.

TiCl₄(l) + Mg(s) → Ti(s) + 2MgCl₂(s)

Balance the following chemical equations and identify the type of chemical reaction.

CaO(s) + SiO₂(s) → CaSiO₃(s)

Balance the following chemical equations and identify the type of chemical reaction.

When a green iron salt is heated strongly, its colour finally changes to black and odor of burning sulphur is given out.

a. Name the iron salt.

b. Name the type of reaction that takes placed during the heating of iron salt.

c. Write the balanced chemical equation for the reaction involved.

A,B and C are three elements which undergo chemical reactions according to the following equations.

A₂O₃ + 2B → B₂O₃ + 2A

3CSO₄ + 2B → B₂(SO₄)₃ + 3C

3CO + 2A → A₂O₃ + 3C

Answer the following questions with reasons.

a. Which element is the most reactive?

b. Which element is the least reactive?

c. What is the type of reactions listed above?

What is a redox reaction? Identify the substance oxidized and the substance reduced in the following reactions.

a. Pb₃O₄ + 8HCl → 3PbCl₂ + Cl₂ + 4H₂O

b. CuO + H₂→ Cu + H₂O

Identify the type of each of the following reactions:

a. A reaction in which a single product is formed from two or more reactants.

b. The reaction mixture becomes warm.

c. An insoluble substance is formed.

Illustrate an activity to show a double displacement reaction. Give the chemical equation of the reaction that takes place.

Why aluminium sheets do not corrode easily? Why does a copper vessel get covered with a green coating in rainy season?

Observe the diagram given alongside and answer the following questions:

a. What do you observe when lead nitrate is heated?

b. Mention the two gases evolved equation for it.

c. Write the balanced chemical equation for it.

d. What is the type of chemical reaction called?

e. Give one more example of this type of reaction.

You are provided with two containers made up of copper and aluminum. You are also provided with solutions of dilute HCl, dilute HNO₃, ZnCl_2, and H₂O. In which of the above containers these solutions can be kept?

(i) Define corrosion. Under what conditions does corrosion take place?

(ii) Give the formula and the chemical name of rust.

Give two methods to slow down rancidity.

Write balanced chemical equations for the following word equations:

(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

(b) Phosphorus pentachloride + Water Phosphoric acid + Hydrogen chloride

(c) Zinc + Silver nitrate Zinc nitrate + Silver

(d) Sodium + water sodium hydroxide + Hydrogen

(e) Aluminium + Copper chloride Aluminium chloride + Copper